H - Electricity – 04 – B
Patent
H - Electricity
04
B
328/164, 379/58
H04B 3/50 (2006.01) H04M 7/00 (2006.01) H04Q 1/46 (2006.01)
Patent
CA 1059246
ABSTRACT OF THE DISCLOSURE The invention relates to a reference signal circuit in a multi- frequency signal receiver in order to obtain a detection of the two signalling frequencies in an incoming voice frequency signal independently of disturbing signals of certain duration. The circuit contains two paths for receiving the incoming signal. One path includes rectifier and attenuation means to give a first signal level dependent on the incoming signal level. The other path includes first comparator means to compare the momentary level of the incoming signal with said first signal level, a time circuit and a second comparator means in order to obtain a second signal level whose magnitude is dependent on the duration of the incoming signal. The outputs of the two signal paths are connected together via a gating circuit to give a reference voltage to analog signal comparators included in the multi-frequency signal receiver.
269274
Carlqvist Bengt R.
Eriksson Anders G.
LandOfFree
Holding circuit in a receiver for detecting two frequencies... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Holding circuit in a receiver for detecting two frequencies..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Holding circuit in a receiver for detecting two frequencies... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1099668